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git-compat-util.h: auto-adjust to compiler support of FLEX_ARRAY a bit better

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When declaring a structure with a flexible array member, instead
of defaulting to the c99 syntax for non-gnu compilers (which
burned people with older compilers), default to the traditional
and more portable "member[1]; /* more */" syntax.

At the same time, other c99 compilers should be able to take
advantage of the modern syntax to flexible array members without
being gcc.  Check __STDC_VERSION__ for that.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2007-11-20 12:08:06 -08:00
parent 137a0d0ef5
commit 8e97399149
1 changed files with 18 additions and 4 deletions
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22
git-compat-util.h
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@ -4,10 +4,24 @@
#define _FILE_OFFSET_BITS 64
#ifndef FLEX_ARRAY
#if defined(__GNUC__) && (__GNUC__ < 3)
#define FLEX_ARRAY 0
#else
#define FLEX_ARRAY /* empty */
/*
* See if our compiler is known to support flexible array members.
*/
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define FLEX_ARRAY /* empty */
#elif defined(__GNUC__)
# if (__GNUC__ >= 3)
# define FLEX_ARRAY /* empty */
# else
# define FLEX_ARRAY 0 /* older GNU extension */
# endif
#endif
/*
* Otherwise, default to safer but a bit wasteful traditional style
*/
#ifndef FLEX_ARRAY
# define FLEX_ARRAY 1
#endif
#endif